Pretty much anything will work for caribou from a .25-06 up to a .300 Mag of some description.
Personally I would try and get a handle on the type of rifle and make that you want and then factor in the cartridge. For a grand you have quite a few choices.
Personally I would try and get a handle on the type of rifle and make that you want and then factor in the cartridge. For a grand you have quite a few choices.